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0603SFP100F Datasheet(PDF) 2 Page - Tyco Electronics |
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0603SFP100F Datasheet(HTML) 2 Page - Tyco Electronics |
2 / 28 page 76 11 Pulse Cycle Derating Once the I2t value for the application waveform has been determined, it must be derated based on the number of cycles expected over the system lifetime. Since the stress induced by the current pulse is mechanical in nature, the number of times the stress is applied has significant bearing on how much derating must be applied to the fuse rating. Figure 5 presents the current pulse derating curve for our surface-mount chip fuses up to 100,000 cycles. Fuse Selection Flowchart However, the basic considerations for fuse selection are shown in the flowchart presented in Figure 6. Following this flow chart will help you select a fuse best suited for your application conditions. Surface-mount Fuse Pulse Derating Curve 100 1000 10000 100000 100% 10% Number of Pulses Figure 5 Step 1 – Determine Steady State Fuse Current Rating Step 2 – Determine Pulse Waveform by Calculating I2t Step 3 – Apply Pulse Cycle Derating Step 4 – Apply Pulse Temperature Derating Step 5 – Apply Derating for Variance in the Circuit Step 6 – Select Fuse Current Rating for Pulse Environment Step 7 – Select Fuse Current Rating (use higher value between Step 1 and Step 6) Step 8 – Check Voltage Rating Apply Standard Steady State Derating (75%) [I fuse ≥ Isys/0.75] Apply Temperature Derating [I fuse ≥ Isys/0.75/Ktemp] Steady State Fuse Current Rating Figure 6 Selecting Surface-mount Fuses Fuse selection seems straightforward, in that, you pick one which has a current rating just a bit higher than your worstcase system operating current. Unfortunately, it’s not that simple. There are derating considerations for operating current and application temperature. Turn-on and other system operations (like processor speed changes or motor start up) cause current surges or spikes that also require consideration when selecting a fuse. So selecting the right fuse for your application is not as simple as knowing the nominal current drawn by the system. Temperature Derating A fuse is a temperature sensitive device. Therefore, operating temperature will have an effect on fuse performance and lifetime. Operating temperature should be taken into consideration when selecting the fuse current rating. The Thermal Derating Curve for surface mount fuses is presented in Figure 4. Use it to determine the derating percentage based on operating temperature and apply it to the derated system current. 1206/0603/0402 Series Temperature Effect on Current Rating 2410 Series Temperature Effect On Current Rating -55 -55 -35 -15 5 25 45 65 85 105 125 -35 -15 5 25 45 65 85 105 145 125 105 100 95 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 110 105 100 95 90 85 80 75 70 65 60 55 50 Maximum Operating Temperature (°C) Maximum Operating Temperature (°C) Figure 4 |
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